Release God's Eye View as open source

src/data/aircraftMeta.js

@@ -0,0 +1,21 @@
+// src/data/aircraftMeta.js
+/**
+ * Sticky per-aircraft metadata merge: once a field has resolved for an
+ * aircraft, a later snapshot that MISSES the field (empty/null — OpenSky and
+ * adsb.lol both do this intermittently) must not regress it. A later snapshot
+ * that CHANGES the field always wins. Pattern from skylight (MIT)
+ * server/src/datasource.ts "sticky enrichment".
+ */
+
+export function stickyText(next, prev) {
+  const n = String(next || '').trim();
+  if (n) return n;
+  const p = String(prev || '').trim();
+  return p || '';
+}
+
+export function stickyNumber(next, prev, fallback) {
+  if (Number.isFinite(next)) return next;
+  if (Number.isFinite(prev)) return prev;
+  return fallback;
+}